Combination toolholder head



July 25, 1950 Filed Jan. 18, 1947 C. L. WAITE EFAL COMBINATIONTOOLHOLDER HEAD 5 Sheets-Sheet 2 ea 4 n @l: 192 .6. a

' I 5 i mm .5 7 f: \H T: w II I" ll l ll I' H H/ L-i U at;

July 25, 1950 c, wAlTE ET AL I 2,516,493

COMBINATION TOOLHOLDER HEAD Filed Jan. 18, 1947 f 3 Sheets-Sheet 3Patented July 25, 1950 COMBINATION TOOLHOLDER Charles L. Waite,Dorchester, and Charles F. Waite, Cambridge, Mass.; said Charles L.Waite assignor to said Charles F. Waite Application January 18, 1947,Serial No. 722,864

1 Claim.

fitted within the, head while the tool-holder and its attached spindleare in rotation.

Also our combination tool-holder head, while primarily intended to beattached to and rotated with a spindle, can be fitted for grinding,boring, or facing on work that is either held stationary or with thework itself revolving.

A further feature consists in the advantage of having the tool-holdingelement interchangeably fitted in the head to be of any desired lengthfor the feeding capacity of the work desired. Also, interchangeabletools can be readily fitted to and removed from our combinationtool-holder head and a quick manual adjustment effected to position thetool relatively with the work and, thereupon, the desired operationcommenced and the automatic feed can be thrown into actuation at anytime.

A further feature consists in the arrangement and detachment of agrinding wheel or tool with a separate motor to rotate the grindingwheel, and the motor and grinder being belt-actuated, permits thegrinder to follow an eccentric grinding path with the belt tight at anytime.

For this purpose we provide an adjustable link and means to slide themotor on a suitable car- V rier as the grinding wheel follows itsrotative path on the work. Also, the grinder could be centered, ifdesired, with the spindle on which the tool-head is mounted. Ourinvention thus enables a standard type of machine with the rotatingspindle, such as a milling machine, to be equipped to do grinding,boring, or facing work with an automatic feed on the operating tool.

A further important feature is the novel and improved method ofactuating the automatic feed by having a toothed star wheelintermittently rotated by striking against a fixed abutment, soconstructed and arranged as to secure a smooth, even, and straight fullline contact between the fixed tooth and the star wheel teeth.

Other novel features, combinations, and important advantages will behereinafter more fully pointed out and claimed.

Referring to the drawings illustrating preferred embodiments of ourpresent invention:

Fig. l is a plan View of our combination toolhead equipped with thegrinding wheel and an actuating motor to rotate the grinding wheelindependently of the rotation of the'spindle on which the tool-holderhead is mounted;

Fig. 2 is a side view of the apparatus as shown in Fig. 1;

Fig. 3 is an enlarged plan view of our combination tool-holder andautomatic feed shown mounted on a rotating spindle;

Fig. 4 is a side view;

Fig. 5 is a detailed view illustrating the full line contact between thestar wheel teeth and the fixed tooth or abutment imparting a rotativemovement and, hence, automatic feeding of the tool-carrying rod;

' Fig. 6 is a further detailed View illustrating a full line separatingoperation between the star wheel teeth and the fixed abutment;

Fig. 7 is an enlarged detail partly in crosssection illustrating theshaft to hold the grinding wheel;

Fig. 8 is illustrative of a modified form of construction wherein thetool head and arrangement of the abutment for automatic feedingactuation are in separate elements;

Fig. 9 is a cross-sectional view on the line 9-9 of Fig. 8, and v Fig.10 is an end view looking from the right of Figs. 3 and 4. I

Fig. 11 is a fragmentary side view illustrating a modified form ofmovable motor mounting.

Referring to the drawings, and particularly Figs. 4, 5, and 6, ourcombination tool-holder head comprises a block I having a cylindricallybored opening therethru as indicated in dotted lines at 2, with a keyway3, said head being formed on a tailstock 5 for attachment to a rotatingspindle. The tailstock 5 has a bearing shown in dotted lines at 6, Fig.3, adjacent the tool head to receive a block In having a correspondingbored opening to fit on the bearing 6. A ring I secured to the surfaceof the bearing by a set screw 8 holds the block it in rotatable positionbetween the ring I and the rear face of the block 1. At one end of theblock I0 is fitted the adjustable abutment or tooth to be moved into andout of contacting position with the teeth on the star wheel to actuatethe feeding movement, to be described. This adjustable tooth I2 isformed with a cylindrical body portion l4 fitted Within acorrespondingly bored opening indicated in dotted lines at l5 andslidable in said bore into and out of operation position.

adjusted either in operative or inoperative posltion.

At the opposite end of the block it, we provide a bored socket 22 and athreaded. cross-opening at right angles to said socket, as indicated at23,'to

fit a rod or other device in the same to hold the block Ill againstrotation on the bearingwhenthe tailstock is attached to a rotatingspindle and.

the tool holder is being rotated. A secondbored opening 24 is fitted, asshown, to be simply attached to a-fi'xed' bracketg-if desired.

Adapted to-slide in the cylindrical-opening 2 in the block I'is-atool-holding cylinder 25 having oneend portion threaded as indicated at'26, and withv tool-holding sockets, he'reinshown a two in number,'2l"-and '2'8,fin-which a cutting ormilling tool maybe fitted. ln the'socket'fl; the 'i'nnerportion'or shank 'of a tool llll'may'be ofsuitable size and cross-section to fit snugly-therein; and'same is heldin position by a set screw-3| fitted'in'the tapped recess 32. in theaxle end of the tool-holder 25, as best shown'inFig. 3'. Thus the tool30 is fittedv and. locke'dand is'readily removedjand replaced in thecylindrical holder .25.

In'the second tool-holding recess 23, I. prefer to fita,flangedbearingfi'with the'flange extende i'ng upwardly and thruaU-"shaped opening in theiaceof, the block I extending fromapproximately the dotted line position 36' tothe opposite edgeh'i'. inthe Uesh-aped' opening'in the face of the plug i andis diametricallyopposite the key diliadapted to slide'in the'k'eyway 3, shown in dottedlines in Fig. 3..

,Thus. the cylindricaltool-holder 25 is slidingly fittedinthe block Iof. our. combination toolholder head, with astrong and rigid bracingconstruction. The tube c'anbe utilizedt'o also receive the shank ofatool and same would be held lII-POSiiJiOIL by a relatively long setscrew fitted in the end'32 of the cyl'indricalitool-hclder 25,,theboredopening 35! extending thru thewalls of the. tube toimpingeagainst theshank of the tool held therein. Thus, the flanged tube 35"corrst'it'utesaltool-holding element and a bracing ele ment for thelongitudinal. movement of the cylindrical tool-holder 25 and also asafstop against thetravel of the cylinder in one directiornviz to the liinit of theU-shapedlsl0t.38,.shown in dotted lines, Fig. 4..

Wealscl provide means to lock thetool-holder 25in the block I, ifdesired, by forming atflattened surface as shown in dotted lines,-Fig.l, at M, which is cngaged byv a socket-headedset screw 42 threaded thrua; correspondingly tapped opening in the side of the block iinalignmentwith. the flattened surface 4]. The inner end ofthis socket set screw 42mayalso constitute a stop in cooperation with the lengthof-theflattenedsurface-M to limitthe lengthwisev adjustmentand, hence, the. feedingmovement of the tool holder 25 -relatively with the block. Y

"Mountedoathe. threaded portion 26: of the cylindricalitool-holder 25;we providesa 'starwheei 50 with a bevelled f-ace il carrying:indications This flangedtube 35 is adapted to slide thereon foradjustment, see Fig. 3, the outer face of the star wheel having a seriesof teeth 52 and the inner face constituting a bearing against the endwall 54 of the block I.

To hold the star wheel 56 in bearing and thrusting engagement with theface 54, we provide a pair of. dove-tailed semi-sectional washers 5555constituting thrust plates attached to a face 54 ofthe block i bycounter-sunk screws 5656, see- Fig. 4, the undercut face of the washers55 being in a sliding fit with the bevel 5|, see Fig. 6. This star'wheelfill' has a plurality of teeth, here shown as ten in number, whichproject into the path of engagement with the abutment [2 when the sameis moved. in outermost or operative position, via, to the right viewingFigs. 4, 5 and 6. Thus,'with the-tailstock 5 secured to the rotatingspindle, and the block it held rigidl against rotation on the tailstock,the block 1 carrying the cylindrical tool-holder 25 and tool 30 will berotated'at-th'e-speed ofrotation of the tailstock and spindle; hence,the-teeth 52"on the star wheel50 will-strike the abutment i2 and beroated one toothforea'ch revo1ution,'thus feeding forwardly thet'oolholder 25 the distance which the star wheel 55 travels on the threadedporticnzt for the space of the movement of one'tooth.

These teeth-52 are formed on a bevel in the star wheel 50 and;accordingly, weso construct, position, and arrange the fixed tooth orabutment'i-z'to strike these'teeth 52 so as to give a full line contactboth' during thetime of contact between the two teeth asthey roll incontact with each other, and a fullline contactat the conclusion' ofsaidmovementwhen the teeth are separated.

For this purpose the' tooth i2 is set on an angle rel-ativel'y'with theaxis of rotation of the star wheel "59 and has its contacting facebevelled to cooperate'withthe bevel of the teeth 52.

In the operation of the apparatus as thus describediia "suitabletco135'is fitted in the socket 21' andthefsetscrew 3i tightened. Theabutmentflz'iskept retractedbris retracted by manipulationof the thumbhutifland the star wheel '5Bis rotated by liand' until the'tool 3G'isinapprcximate'de'sired position to operate on theiwork. Thereupon thethumbnut 2!] is moved to'slide the abutment P2 intofth'e path of theteeth 52' of the 'star 'wheeftc and the power turned on forrotatio'nofthe spindle to which the tail stock 5is attached?Asithe'block irotates, the tool 3llwi1l'be swung around the circular arcto Which'it has beenadjiist'ed and will be fed forwardly step-bystepinto-the work by the intermittent action of the starwheel' Sii'b'y itssuccessive teeth-'52 striking. against the abutment I 2 until the workis completed.

'Where a short boring or facing operation is desired; the tool canbefitted in the tube'35 and the same operation repeated. 'Meanwh'ile,the blockl0 will beheldagainst rotative movement by any suitableattachment secured to the same thru the bored recesses 22, 23, or Handattached to some fixed part of the worktable, bench; or machine;

"Referring to the separately rotating grinder wheel attachment asillustrated in Figs. 1, 2, and "I, weattach-t'othe block lllby socketset screws thru the bored openings 25 and 24, a bracket 60 formed at oneend of a plate 6i, carrying a pair of dovetailed-s lides 52-52 in whicha sliding plate-E4 may travel, this plate carrying a motor designatedgenerally at 65. On one end of'the projecting armature'shait 86 of themotor, we

attach a pulley 67 around which a V-Shaped belt 68 is led, which, inturn, is led around a pulley '70 mounted to rotate freely on a bearing7| carried by a shaft 72. This shaft would project into the head I,being fitted, for example, in the flanged tube 85 on the cylindricaltool holder and would be retained in position thru a set screw or thelike in a depression 74 in the end of the shaft '72.

Thus, the pulley 70 would be loosely rotating on the bearing 7| whilethe shaft 72 would be in fixed position and would be acted upon to befed forwardly by the action of the star wheel and abutment I2. The shaft72 has reduced bearings formed thereon, see Fig. 7, to carry ballbearingraceways I4 and I6 assembled within a rotatable circular housing orcasing 77, being held, respectively, in position by a nut '78 at one endthreaded around a reduced portion of the shaft adjacent the raceway 76,and by a ring nut 79 at the other end threaded into an inner circularthreaded opening near the open end of the circular casing T7. The casinghas an outstanding flange 80 which may be secured to a correspondingcircular flange ill on the pulley '70.

A plurality of set screws 82 arranged peripherally around these flangesunite same. The reduced sections of the shafts '72 are indicated at 83and 04, and a ring spacer 85 is fitted between the ballbearing racewaysas clearly shown in Fig. '7, thus giving a firm bearing and leverage.The bearing '74 would normally have its lower ring contacting directlyonto the reduced portion 84 of said shaft; and we prefer to supply abushing 86' for the inner raceway 86, which bushing has a rim 87 to holdthe bearing firmly between the said rim and the nut 78 without bindingon the other raceway 84. The casing I7 is formed, preferably, as anintegral part with an extending shaft 90, which carries the grindingwheel 9| on its outer end, being threaded or otherwise united thereto inany suitable manner as by a hub threaded into the correspondinglythreaded end 92 of the shaft portion 99 and locked by a nut 94 on theouter end, thus binding the grinder 9| in rigid rotation with the shaft90.

In order to hold the belt 68 in driving relation between the pulley 6'7on the motor and the pulley '70 on the grinder shaft 90 while thegrinder follows its circular arc or path upon the work, we

provide a rigid adjustable belt tightener, comprising telescoping arms95 and 96 interlocking in the intermediate portions and being bound inadjusted position by a nut 97 on a bolt 98 passing thru slots 9999 ineach of the overlapping portions of the arms 95 and 96, see Figs. 1 and2.

The end of the arm 95 has a hole of suitable diameter to envelope theshaft 65, and the opposite end of the arm 95 has a corresponding hole toenable the arm to encircle the shaft '72. Thus, as the grinder isactuated in its arc, the entire motor 65 may be slid to and fro on theplate 64 in the guide 62 by this rigid link construction andsimultaneously keep the belt 68 tight and the grinder rotating.

Referring to Figs. 8 and 9, a modified form is shown wherein the toolhead I, with its toolholder and feeding star wheel and connected parts,is formed separately from the block carrying the abutment I2, whichlatter may be spaced a considerable distance from the head I in order torelieve weight on the supporting shaft. For this purpose, we would makethe abutment I2 on a shank of considerable length and would mount theblock |00 between collars IM and I02 on the shaft I03. Preferably thecollar I0| would be provided with a hollow hub I05 on which the blockI00 would fit. The lower part of the block I00 is fitted with a lug I06,to which is attached a brace or bracket |0| by a bolt I08 or a pair ofbolts, as indicated in Fig. 8, the bracket extending to the fixed partof the machine or worktable so as to hold the block I00 in non-rotativeposition on the shaft I03. The abutment I2 may be moved into and out ofoperative position by the thumb nut I20 and the entire operation isidentical to that already described, but it enables us to make twoattachments spaced from the end of the shaft which supports both, aswill be readily appreciated.

Referring to Fig. 11 illustrating a modified form of movable mountingfor the motor 65 and the rigid link connection to hold the belt 68 underdesired tension while the grinder follows its 01- bital path, we mountthe motor 65 on a pivotal, rocking, or hinged construction. For thispurpose we may provide a typical hinge comprising one leaf I23 which issecured to the support 6|, and a second leaf I24 attached to one of themotor r supports, the two leaves being adapted to rock on a pivot pinI25.

Thus the motor 65 may rock back and forth on the pivot I25 while thebelt 68 and rigid adjustable link elements and 96 hold the belt 68 undertension and drive the grinder 9| during its orbital path. This modifiedform of construction is also important as utilizing the weight of themotor 65 bearing against the belt 68 during the adjustment of the linkelements 95 and 96.

- Also, this hinge construction or an equivalent swinging movableactuation eliminates the danger of filings, dust, or dirt getting intothe slide 62 in the form shown in Fig. 2.

It is also important that the axis of the pulley 67 be considered as thecentral point for attachment of both the link elements and the belt, thesame being herein shown as the shaft of the motor 66, but in case a gearreduction is employed between the motor and the driving belt 67, theaxis of the pulley is necessarily concentric in the attachment of boththe adjustable link elements 95 and 96 as well as the belt 68, as willbe readily appreciated.

We claim:

A combination tool head of the kind described having a slidingtool-holding element adapted to traverse said tool-head within fixedlimits, a rotatable member on said slide to effect the sliding movementrelatively with the tool head, said rotatable member being held inassembled position by a pair of dovetailed semi-sectional thrust platesremovably secured to the head.

CHARLES L. WAITE. CHARLES F. WAITE.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,191,813 Mummert et al. July 18,1916 1,361,686 Conwell Dec. '7, 1920 1,394,836 Jackson Oct. 25, 19211,962,951 Conwell June 12, 1934 2,405,748 Johnson Aug. 13, 1946 FOREIGNPATENTS Number Country Date 36,306 Germany Aug. 2'7, 1886

